Description:
------------
Using the crypt function, identical code will result in an output that will vary depending on the PHP version.

Test script:
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<?php

$salt = "KFtIFW1vulG5nUH3a0Mv";
$password = "testtest";

$key = '$2y$07$';
$key = $key.$salt."$"; 

echo crypt($password, $key);

?>

Expected result:
----------------
I expect the result to be the same for every version, as this function can be used for login/passwords and updating PHP can result in an unusable login.

Actual result:
--------------
An example can be seen here: http://3v4l.org/qqHUe


-Output for 5.3.7 - 5.4.41, 5.5.21 - 5.5.25, 5.6.5 - 5.6.9:
$2y$07$KFtIFW1vulG5nUH3a0Mv$.0imhrNa/laTsN0Ioj5m357/a8AxxF2q

-Output for 5.5.0 - 5.5.20, 5.6.0 - 5.6.4:
$2y$07$KFtIFW1vulG5nUH3a0Mv$e0imhrNa/laTsN0Ioj5m357/a8AxxF2q